An author whose book has become a reference for those trying to understand Hamas's tunnel network and its impact on the current war has told FRANCE 24 that Israel must eventually enter them to ensure their destruction. Daphné Richemond-Barak started her book "Underground Warfare" 10 years ago, when one of the first large Hamas tunnels into Israel was discovered. Her book documents the use of tunnels in many conflicts, including Vietnam and even World War I. She spoke to us in Perspective.